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a, Chevron Groundwater Monitoring Report(2Q2001) Page 2 of 2 Facility #9-6171—6633 Pacific Avenue Stockton CA Date July 13,2001 DISCUSSION: This groundwater monitoring and sampling event was performed by Gettler-Ryan Inc on May 23 and 25,2001 Six wells were monitored and sampled on May 23,2001 On May 25,2001,the first six wells were monitored again and six new wells(Mw-8 thru MW-10, and MW-12 thru MW-14)were monitored and sampled TPHg was reported in seven of the twelve wells sampled at concentrations ranging from 97 pg/l in MW-13 to 360 µg/1 in MW-2 Benzene was reported at concentrations of 0 71 µg/1 in MW-6 MtBE was reported in samples from four wells at concentrations ranging from 3 5 pg/1 in MW-2 to 740µg/1 in MW-8 The MtBE concentrations in MW-8 were confirmed through analysis by EPA Method 8260B with a result of 640 µg/l EPA Method 8260B analysis of samples collected from the six new wells reported non detect for methanol, ethanol, TBA, DIPE, ETBE,TAME, 1,2-DCA,and EDB Groundwater elevations across the site increased an average of approximately 0 23 feet this quarter Groundwater flow was reported to the northwest at 0 005 to 0 02 ft/ft and southeast at 0 003 ft/ft LIMITATIONS: The findings presented in this letter are based on data and interpretations provided by Gettler-Ryan, Inc Gettler- Ryan's report is attached The data presented in this summary is accurate only to the degree implied by the sources and methods used No warranty,expressed or implied, is made by SECOR If you have any questions,please feel free to call us at(916) 861-0400 Sincerely, SECOR International Inc a William E Brasher, P E Project Manager ATTACHMENTS: • Table 1 —Screen Intervals • Attachment A—June 25,2001 Groundwater Monitoring& Sampling Report by Gettler-Ryan Inc cc Bob Cochran,Chevron Products Company, P O Box 6004, San Ramon,CA 94583-0804 Marty Hartzell, RWQCB-CVR, 3443 Routier Road, Suite A, Sacramento, CA 95827 Wilbur Smith II, Sims-Grupe Management,374 Lincoln Center, Stockton, CA 95207 Donald Bradshaw,Levine-Fricke-Recon, 1900 Powell Street, 12"Floor, Emeryville,CA 94608-1827